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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 6 of 6 (0.031 seconds)Spelling suggestions: "subject:"tagg"" "subject:"tgt""
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Processing And Characterization Of Textured Barium Ferrite CeramicsAydogan, Eda 01 July 2012 (has links) (PDF)
Technological advances results in the fact that quite a large number of electronic equipment interacts with its environment leading to the malfunction of the devices. This brings about the necessity of using proper electromagnetic (EM) wave absorbers/shields to avoid such interactions. In order to absorb EM waves in a large frequency band from several MHz to GHz, barium hexaferrite (BaHF) ceramics which are produced as textured ceramics as well as in multilayered form can be used. Textured ceramics are processed by tape casting using templated grain growth (TGG) phenomenon. In order to obtain textured ceramics, BaHF powders and platelets are required as raw materials in such a way that during sintering small size powders are directioned by large platelet surfaces. In this study, ferrite powders were synthesized by mixed oxide technique while the platelets were produced by both molten salt synthesis (MSS) and reactive templated grain growth (RTGG) methods. In the case of platelet synthesis by MSS, effects of calcination temperature and time as well as type and composition of the flux on the formation and morphology of platelets were investigated based on the XRD and SEM results. Studies have shown that KCl flux led to the formation of sharper platelet morphology, while NaCl resulted in more round shapes. However, extent of BaHF formation in the case of NaCl was higher when compared to KCl flux due to its higher wettability characteristic, and hence faster interaction with the raw materials. Since the aspect ratio of the synthesized platelets was only ca. 2-4, these platelets were not efficient for further TGG studies. Alternatively, BiFeO3 (BiF) particles having ~30-40 &mu / m average size were synthesized as seed crystals for the synthesis of BaHF platelets by RTGG method. After the washing of these platelets with dilute HNO3, pure BaHF powders and platelets were directed by tape casting which was followed by sintering using TGG phenomenon. Degree of achieved texturing in the processed ceramics was studied using Rietveld analysis, pole figure measurement and electron backscattered diffraction (EBSD).
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Mean-field view on geodynamo models / Erddynamo-Modelle aus Sicht der Theorie mittlerer FelderSchrinner, Martin 13 July 2005 (has links)
No description available.
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Numerical Simulations of the Gravitational Geodynamo and its Time Spectrum / Numerische Simulationen des gravitationsgetriebenen Dynamos und sein zeitliches SpektrumTanriverdi, Vedat 28 June 2011 (has links)
No description available.
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Multi-dimensional Polarized Radiative Transfer Modeling of Titan's Atmosphere / Ein multi-dimensionales, polarisiertes Strahlungstransportmodell für Titans AtmosphäreSalinas Cortijo, Santo Valentin 23 June 2003 (has links)
No description available.
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Development and Optimization of an Integrated Faraday Modulator and Compensator Design for Continuous Polarimetric Glucose MonitoringClarke, Brandon William 22 August 2013 (has links)
No description available.
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Bildgebung und chemische Analytik mit Laserdesorptions-Massenspektrometrie im Bereich Forensik und Astrophysik / Imaging and Chemical Analysis with Laser Desorption Mass Spectrometry in Forensics and AstrophysicsBeinsen, Alexander 21 June 2011 (has links)
No description available.
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